I have an '06 and I currently run 756s on both ends. The knobs on the front have started to round off, they are still fairly big but not square anymore. Is it time to replace it or can I use it for a while longer? I want to get the most hookup up front because of the obvious shortcomming of my bikes turning abilities. I ride at most of the local socal tracks, Perris is about the hardest pack dirt I ride, so with that would you recommend sticking with the 756 up front or is there a better front tire option out there?